1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.actions.search;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.marktr;
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5 | import static org.openstreetmap.josm.tools.I18n.tr;
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6 |
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7 | import java.io.IOException;
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8 | import java.io.Reader;
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9 |
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10 | import org.openstreetmap.josm.actions.search.SearchCompiler.ParseError;
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11 |
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12 | public class PushbackTokenizer {
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13 |
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14 | public class Range {
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15 | private final long start;
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16 | private final long end;
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17 |
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18 | public Range(long start, long end) {
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19 | this.start = start;
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20 | this.end = end;
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21 | }
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22 |
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23 | public long getStart() {
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24 | return start;
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25 | }
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26 |
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27 | public long getEnd() {
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28 | return end;
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29 | }
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30 | }
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31 |
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32 | private final Reader search;
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33 |
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34 | private Token currentToken;
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35 | private String currentText;
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36 | private long currentNumber;
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37 | private long currentRange;
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38 | private int c;
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39 |
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40 | public PushbackTokenizer(Reader search) {
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41 | this.search = search;
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42 | getChar();
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43 | }
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44 |
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45 | public enum Token {
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46 | NOT(marktr("<not>")), OR(marktr("<or>")), LEFT_PARENT(marktr("<left parent>")),
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47 | RIGHT_PARENT(marktr("<right parent>")), COLON(marktr("<colon>")), EQUALS(marktr("<equals>")),
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48 | KEY(marktr("<key>")), QUESTION_MARK(marktr("<question mark>")), NUMBER(marktr("<number>")),
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49 | RANGE(marktr("range")), EOF(marktr("<end-of-file>"));
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50 |
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51 | private Token(String name) {
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52 | this.name = name;
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53 | }
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54 |
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55 | private final String name;
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56 |
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57 | @Override
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58 | public String toString() {
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59 | return tr(name);
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60 | }
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61 | }
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62 |
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63 |
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64 | private void getChar() {
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65 | try {
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66 | c = search.read();
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67 | } catch (IOException e) {
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68 | throw new RuntimeException(e.getMessage(), e);
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69 | }
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70 | }
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71 |
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72 | private long getNumber() {
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73 | long result = 0;
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74 | while (Character.isDigit(c)) {
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75 | result = result * 10 + (c - '0');
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76 | getChar();
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77 | }
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78 | return result;
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79 | }
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80 |
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81 | /**
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82 | * The token returned is <code>null</code> or starts with an identifier character:
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83 | * - for an '-'. This will be the only character
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84 | * : for an key. The value is the next token
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85 | * | for "OR"
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86 | * ' ' for anything else.
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87 | * @return The next token in the stream.
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88 | */
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89 | public Token nextToken() {
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90 | if (currentToken != null) {
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91 | Token result = currentToken;
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92 | currentToken = null;
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93 | return result;
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94 | }
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95 |
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96 | while (Character.isWhitespace(c)) {
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97 | getChar();
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98 | }
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99 | switch (c) {
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100 | case -1:
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101 | getChar();
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102 | return Token.EOF;
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103 | case ':':
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104 | getChar();
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105 | return Token.COLON;
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106 | case '=':
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107 | getChar();
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108 | return Token.EQUALS;
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109 | case '-':
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110 | getChar();
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111 | if (Character.isDigit(c)) {
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112 | currentNumber = -1 * getNumber();
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113 | return Token.NUMBER;
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114 | } else
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115 | return Token.NOT;
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116 | case '(':
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117 | getChar();
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118 | return Token.LEFT_PARENT;
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119 | case ')':
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120 | getChar();
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121 | return Token.RIGHT_PARENT;
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122 | case '|':
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123 | getChar();
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124 | return Token.OR;
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125 | case '?':
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126 | getChar();
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127 | return Token.QUESTION_MARK;
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128 | case '"':
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129 | {
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130 | getChar();
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131 | StringBuilder s = new StringBuilder();
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132 | boolean escape = false;
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133 | while (c != -1 && (c != '"' || escape)) {
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134 | if (c == '\\' && !escape) {
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135 | escape = true;
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136 | } else {
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137 | s.append((char)c);
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138 | escape = false;
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139 | }
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140 | getChar();
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141 | }
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142 | getChar();
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143 | currentText = s.toString();
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144 | return Token.KEY;
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145 | }
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146 | default:
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147 | {
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148 | if (Character.isDigit(c)) {
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149 | currentNumber = getNumber();
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150 | if (c == '-') {
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151 | getChar();
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152 | currentRange = getNumber();
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153 | return Token.RANGE;
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154 | } else
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155 | return Token.NUMBER;
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156 |
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157 | }
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158 |
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159 | StringBuilder s = new StringBuilder();
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160 | while (!(c == -1 || Character.isWhitespace(c) || c == '"'|| c == ':' || c == '(' || c == ')' || c == '|' || c == '=' || c == '?')) {
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161 | s.append((char)c);
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162 | getChar();
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163 | }
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164 | currentText = s.toString();
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165 | if ("or".equals(currentText))
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166 | return Token.OR;
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167 | else
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168 | return Token.KEY;
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169 | }
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170 | }
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171 | }
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172 |
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173 | public boolean readIfEqual(Token token) {
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174 | Token nextTok = nextToken();
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175 | if (nextTok == null ? token == null : nextTok == token)
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176 | return true;
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177 | currentToken = nextTok;
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178 | return false;
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179 | }
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180 |
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181 | public String readTextOrNumber() {
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182 | Token nextTok = nextToken();
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183 | if (nextTok == Token.KEY)
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184 | return currentText;
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185 | if (nextTok == Token.NUMBER)
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186 | return String.valueOf(currentNumber);
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187 | currentToken = nextTok;
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188 | return null;
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189 | }
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190 |
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191 | public long readNumber(String errorMessage) throws ParseError {
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192 | if (nextToken() == Token.NUMBER)
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193 | return currentNumber;
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194 | else
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195 | throw new ParseError(errorMessage);
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196 | }
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197 |
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198 | public long getReadNumber() {
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199 | return currentNumber;
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200 | }
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201 |
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202 | public Range readRange() throws ParseError {
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203 | Token token = nextToken();
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204 | if (token == Token.NUMBER)
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205 | return new Range(currentNumber, currentNumber);
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206 | else if (token == Token.RANGE)
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207 | return new Range(currentNumber, currentRange);
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208 | else
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209 | throw new ParseError(Token.NUMBER, token);
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210 | }
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211 |
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212 | public String getText() {
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213 | return currentText;
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214 | }
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215 | }
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